Finally got round to trying it out… DJI V1s, caddx vista. And just the one 7 turn antenna, the others were standard dji.
Got out to 5.6km on a li ion, mbps still around 30! Could have gone further, but worried about battery.
You have to make sure you’re aiming the antenna straight at the drone, there’s a 20deg cone to work with. But I was pleasantly surprised by flight 1!